Symptom Information: Sort according to HPO 

1
(HPO:0001319) Neonatal hypotonia rare [HPO:skoehler] 101 / 7739
2
(HPO:0001324) Muscle weakness 859 / 7739
3
(HPO:0003326) Myalgia 143 / 7739
4
(HPO:0003552) Muscle stiffness 23 / 7739
5
(HPO:0003712) Skeletal muscle hypertrophy 42 / 7739
6
(HPO:0005348) Inspiratory stridor 8 / 7739
7
(HPO:0010548) Percussion myotonia 5 / 7739
8
(HPO:0011809) Paradoxical myotonia 1 / 7739
9
(HPO:0011968) Feeding difficulties 240 / 7739
10
(OMIM) Inspiratory stridor in early life 1 / 7739
11
(OMIM) Poor feeding in early life 1 / 7739
12
(OMIM) Myotonia, cold-sensitive, predominantly of face, tongue, forearm, and hand precipitated by muscle cooling or cold exposure or rest after exercise 1 / 7739
13
(OMIM) Transient neonatal hypotonia (less common) 1 / 7739
14
(OMIM) Grip myotonia 1 / 7739
15
(OMIM) Muscle weakness after cooling or on warming affected muscle 1 / 7739
16
(OMIM) Decreased muscle action potential after warming affected muscle 1 / 7739
17
(OMIM) Episodic weakness may or may not occur independent of myotonia 1 / 7739
18
(OMIM) Usually no myopathic changes on biopsy 1 / 7739
19
(OMIM) Potassium sensitivity has been reported 1 / 7739
20
(HPO:0000006) Autosomal dominant inheritance 2518 / 7739
21
(HPO:0003593) Infantile onset 249 / 7739
22
(HPO:0003812) Phenotypic variability 129 / 7739
23
(HPO:0012899) Handgrip myotonia 2 / 7739